I just finished an Advanced Jboss training class last week, and during a disccussion on classloaders, the following idea occurred to me.

When the classloader encounters a Java class which has already been loaded, it just ignores it. This can cause problems when there is more than one version of a class among diferent archives.

Why not have

• a warning, optional if neccessary, that would warn the developer that the same class occurred in multiple archives
  
• a warning if the duplicate class is not indentical to the previously encountered occurence